235 lines
7.5 KiB
C
235 lines
7.5 KiB
C
/* seh pdata/xdata coff object file format
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Copyright 2009
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Free Software Foundation, Inc.
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This file is part of GAS.
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GAS is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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GAS is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GAS; see the file COPYING. If not, write to the Free
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Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
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02110-1301, USA. */
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/* Short overview:
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There are at the moment three different function entry formats preset.
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The first is the MIPS one. The second version
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is for ARM, PPC, SH3, and SH4 mainly for Windows CE.
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The third is the IA64 and x64 version. Note, the IA64 isn't implemented yet,
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but to find information about it, please see specification about IA64 on
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http://download.intel.com/design/Itanium/Downloads/245358.pdf file.
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The first version has just entries in the pdata section: BeginAddress,
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EndAddress, ExceptionHandler, HandlerData, and PrologueEndAddress. Each
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value is a pointer to the corresponding data and has size of 4 bytes.
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The second variant has the following entries in the pdata section.
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BeginAddress, PrologueLength (8 bits), EndAddress (22 bits),
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Use-32-bit-instruction (1 bit), and Exception-Handler-Exists (1 bit).
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If the FunctionLength is zero, or the Exception-Handler-Exists bit
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is true, a PDATA_EH block is placed directly before function entry.
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The third version has a function entry block of BeginAddress (RVA),
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EndAddress (RVA), and UnwindData (RVA). The description of the
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prologue, excepetion-handler, and additional SEH data is stored
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within the UNWIND_DATA field in the xdata section.
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The pseudos:
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.seh_proc <fct_name>
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.seh_endprologue
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.seh_handler <handler>[,<handler-data>]]
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.seh_eh
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.seh_32/.seh_no32
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.seh_endproc
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.seh_setframe <reg>,<offset>
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.seh_stackalloc
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.seh_pushreg
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.seh_savereg
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.seh_savemm
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.seh_savexmm
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.seh_pushframe
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.seh_scope
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*/
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/* architecture specific pdata/xdata handling. */
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#define SEH_CMDS \
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{"seh_proc", obj_coff_seh_proc, 0}, \
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{"seh_endproc", obj_coff_seh_endproc, 0}, \
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{"seh_pushreg", obj_coff_seh_push, 0}, \
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{"seh_savereg", obj_coff_seh_save, 0}, \
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{"seh_savemm", obj_coff_seh_save, 1}, \
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{"seh_savexmm", obj_coff_seh_save, 2}, \
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{"seh_pushframe", obj_coff_seh_push, 1}, \
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{"seh_endprologue", obj_coff_seh_endprologue, 0}, \
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{"seh_setframe", obj_coff_seh_setframe, 0}, \
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{"seh_stackalloc", obj_coff_seh_stack_alloc, 0}, \
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{"seh_handler", obj_coff_seh_handler, 0}, \
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{"seh_eh", obj_coff_seh_eh, 0}, \
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{"seh_32", obj_coff_seh_32, 1}, \
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{"seh_no32", obj_coff_seh_32, 0}, \
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{"seh_scope", obj_coff_seh_scope, 0},
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/* Type definitions. */
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typedef struct seh_prologue_element
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{
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symbolS *pc_addr;
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char *pc_symbol;
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int kind;
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int reg;
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bfd_vma offset;
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} seh_prologue_element;
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typedef struct seh_scope_elem {
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char *begin_addr;
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char *end_addr;
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char *handler_addr;
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char *jump_addr;
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} seh_scope_elem;
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typedef struct seh_context
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{
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struct seh_context *next;
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/* Was record alread processed. */
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int done;
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/* Function name. */
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char *func_name;
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/* BeginAddress. */
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char *start_symbol;
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symbolS *start_addr;
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bfd_vma start_offset;
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/* EndAddress. */
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char *end_symbol;
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symbolS *end_addr;
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bfd_vma end_offset;
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/* PrologueEnd. */
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char *endprologue_symbol;
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symbolS *endprologue_addr;
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bfd_vma endprologue_offset;
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/* ExceptionHandler. */
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char *handler_name;
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/* ExceptionHandlerData. */
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char *handler_data_name;
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int handler_written;
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/* WinCE specific data. */
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int use_instruction_32;
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/* the bfd to store data within. */
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bfd *abfd;
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/* the current section to generate data within. */
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asection *section;
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/* Relocations for section. */
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unsigned int count_reloc;
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/* Symbols within section. */
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unsigned int count_syms;
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/* Iterator for text lable generation. */
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unsigned int tlbl_count;
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/* Iterator for xdata lable generation. */
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unsigned int xlbl_count;
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/* The name of the first xdata label. */
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char *xdata_first;
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/* FIelds used for x64 generation of chained information. */
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char **xdata_names;
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char **xdata_pcsyms;
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int *xdata_elm_start;
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/* Size and offset within current generated xdata section. */
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size_t xdata_sz;
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size_t xdata_offset;
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/* x64 framereg and frame offset information. */
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int framereg;
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bfd_vma frameoff;
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/* Information about x64 specific unwind data fields. */
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size_t elems_count;
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size_t elems_max;
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seh_prologue_element *elems;
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size_t scope_max;
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size_t scope_count;
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seh_scope_elem *scopes;
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} seh_context;
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typedef enum seh_kind {
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seh_kind_unknown = 0,
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seh_kind_mips = 1, /* Used for MIPS and x86 pdata generation. */
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seh_kind_arm = 2, /* Used for ARM, PPC, SH3, and SH4 pdata (PDATA_EH) generation. */
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seh_kind_x64 = 3 /* Used for IA64 and x64 pdata/xdata generation. */
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} seh_kind;
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/* Forward declarations. */
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static void obj_coff_seh_stack_alloc (int);
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static void obj_coff_seh_setframe (int);
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static void obj_coff_seh_endprologue (int);
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static void obj_coff_seh_save (int);
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static void obj_coff_seh_push (int);
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static void obj_coff_seh_endproc (int);
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static void obj_coff_seh_eh (int);
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static void obj_coff_seh_32 (int);
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static void obj_coff_seh_proc (int);
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static void obj_coff_seh_handler (int);
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static void obj_coff_seh_scope (int);
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static int seh_read_offset (const char *, bfd_vma *);
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static int seh_x64_read_reg (const char *, int, int *);
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static void seh_x64_make_prologue_element (int, int, bfd_vma);
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static void make_function_entry_pdata (seh_context *c);
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#define UNDSEC (asection *) &bfd_und_section
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/* Check if x64 UNW_... macros are already defined. */
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#ifndef PEX64_FLAG_NHANDLER
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/* We can't include here coff/pe.h header. So we have to copy macros
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from coff/pe.h here. */
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#define PEX64_UNWCODE_CODE(VAL) ((VAL) & 0xf)
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#define PEX64_UNWCODE_INFO(VAL) (((VAL) >> 4) & 0xf)
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/* The unwind info. */
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#define UNW_FLAG_NHANDLER 0
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#define UNW_FLAG_EHANDLER 1
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#define UNW_FLAG_UHANDLER 2
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#define UNW_FLAG_FHANDLER 3
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#define UNW_FLAG_CHAININFO 4
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#define UNW_FLAG_MASK 0x1f
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/* The unwind codes. */
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#define UWOP_PUSH_NONVOL 0
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#define UWOP_ALLOC_LARGE 1
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#define UWOP_ALLOC_SMALL 2
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#define UWOP_SET_FPREG 3
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#define UWOP_SAVE_NONVOL 4
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#define UWOP_SAVE_NONVOL_FAR 5
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#define UWOP_SAVE_XMM 6
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#define UWOP_SAVE_XMM_FAR 7
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#define UWOP_SAVE_XMM128 8
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#define UWOP_SAVE_XMM128_FAR 9
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#define UWOP_PUSH_MACHFRAME 10
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#define PEX64_UWI_VERSION(VAL) ((VAL) & 7)
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#define PEX64_UWI_FLAGS(VAL) (((VAL) >> 3) & 0x1f)
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#define PEX64_UWI_FRAMEREG(VAL) ((VAL) & 0xf)
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#define PEX64_UWI_FRAMEOFF(VAL) (((VAL) >> 4) & 0xf)
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#define PEX64_UWI_SIZEOF_UWCODE_ARRAY(VAL) \
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((((VAL) + 1) & ~1) * 2)
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#define PEX64_OFFSET_TO_UNWIND_CODE 0x4
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#define PEX64_OFFSET_TO_HANDLER_RVA (COUNTOFUNWINDCODES) \
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(PEX64_OFFSET_TO_UNWIND_CODE + \
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PEX64_UWI_SIZEOF_UWCODE_ARRAY(COUNTOFUNWINDCODES))
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#define PEX64_OFFSET_TO_SCOPE_COUNT(COUNTOFUNWINDCODES) \
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(PEX64_OFFSET_TO_HANDLER_RVA(COUNTOFUNWINDCODES) + 4)
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#define PEX64_SCOPE_ENTRY(COUNTOFUNWINDCODES, IDX) \
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(PEX64_OFFSET_TO_SCOPE_COUNT(COUNTOFUNWINDCODES) + \
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PEX64_SCOPE_ENTRY_SIZE * (IDX))
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#endif
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